Turbine.



H. F. SCHMIDT.

TURBINE.

Anmouxon run we. 1a, 1909.

Patented Mar. 7, 1911.

2 BHEBTik-SHEET 1.

- M'JA TTORNEY IN FACT.

H. F. SCHMIDT. I

V TURBINE APPLICATION FILED AUG. 18. r

Patented Mar. 1911.

2 SHEBTS'SHEIIT 2.

' 1N VENTOR. H? A... :4

W -1 TTORNE Y m 4 r" UNITED STATES FATENT OFFICE. ma '1. seminar; on Prrrssuno, rrunsYLvanranssienon To run wns'rme- Housn MACHINE COMPANY acronronn rron or rnn-nsvnvnnm.

TURBINE.

Application f led August 18, 1999. Serial No; 513,433.

and State of Pennsylvania, have made a new and useful Invention in Turbines, of which the following is a specification.

This invention relates to turbines and has for an object to produce a small sized turbine of relatively large capacity. A further object is to reduce means for reversing the direction or the fluid after it' has done work in one series, of working passages and for delivering it to a second series '15- carried on the same working wheel.

A-further object is to produce means for reversing the directional the motive fluid after it has been delivered from a row of blades and for redirecting it so that it is again delivered to' the same row of blades, but to a portion of. thebladcs through which it has not previously passed.

A- further object is to produce a blade provided with two radially disposed workin portions through which the fluid is adapte topass in opposite directions.

A further object is to produce 2' ersing and redirecting channels which are upl in construction, easily assembled and z-'fective in operation.

These and other objects I attain by means of an apparatus embodying the features herein described and illustrated.

In the drawings accompanying this application and forming a part thereof: Figure l is a. fragmental sectional elevation of a turbine embodying my invention; Fig. 2 is a artial section along the lin 22 of Fig.- 1; *i 3 is a perspective view of a blade embo ying my invention; Fig. i is a fragmental view of the turhinewheel provided with blades, embodying my invention; .Fig.

- 5 is a section along the line 5-5 of Fig. 3;

6 is a plan view of the channel bevels on which a number of channel shrouds are secured; and Figs. '7 and 8 are perspective v ews of a. guide block partition piece which forms a detail of my invention. v

The turbine illustrated as embodying my invent-ion is provided with means, such for -p' -1 diverging nozzles for initially and directing the motive fluid to elements. The Enid delivered by the nozzles, after having tra versed a row ofworking passas cs awed by the working elements carried by the turbine wheel. is received by a series of reversing channels and, after being reversed in direction, is delivered to a'second row of working passages formed by the same elements. i

\ Although I do not consider it necessary to illustrate the various modifications and arrangemcnts of my invention, it will be understood that the steam may be expanded 'by additional means after it has been discharged a. second time from the working elements and that it may then be delivered to additional wheels or to additional rcv's of elements carried by the samew' 2-01. The arrangements may also be such that the steam may be delivered to an additional row of working elements without further expansion or it may be expanded after-each ab straction of energy and it may be reversed one or more times in traversing the working element carried by one wheel. The features of my invention may also be embodied in a. reaction type of turbine, in which the steam is expanded in each row of working passages.

Referring to the drawings by means of the reference numerals: The turbine illustrated includes a casing 7, which is provided with steam inlet and exhaust ports, and a rotor element 8, on which blades 9 are mounted. The inlet port communicates with a passage 10, formed in the casing and which communicates with and delivers steam to one or more diverging or expansion nozzles 11; The nozzles 11 deliver steam to the blades -9.

Each blade 9 is provided with a concave working face 12 and convex face 13, which is provided with transversely extending slots lei and 15and which is of such contour that it fits snugly against the concave face of the next adjacent blade when the bladesmre in place on the turbine wheel. The slots 14 and 15 form steam passages between the blades which render the concave face-of each blade effective as working elements, at two points along the blades. ldach blade is provided with a mounting portion which-may cons1st of a cylindrical shank 16 adapted .to be secured into radially extending openings in the peripheral faceiol' the wheel 8 by means of pins 17 which extend. through transversely extend- 1 ing holes 18, provided in the shank-16 of the blade, and which are riveted over at each blade between the slots 14: and is cored i side of the wheel 8 to hold the blade seis covered by the concave face of the next au acent blade when the blad s are-1n place on the turbine, it does not effect the flow of steam through the turbine.

The nozzles 11 deliver steam to the annular row of passages formed by the coiiperation of the slots 14 and the concave faces of the blades. The steam in traversing these passages, imparts a portion of its velocity energy to the blades and is delivered to a series of reversing); channels 21, which redirect it and. deliver it to the annular row of passages, formed by the'cooperation'of the slots 15 and the faces 12 of the blades. The steam delivered to the blades by the reversing channels, imparts its available kinetic energy to the blades and is discancer the coiiperation of a charged by them into the exhaust passages of the turbine. 5 r

In order that the blades may be milled one operation and that the outlet angles of the working passages formed by the slots 14 may be greater than the inlet angle of the working passages formed by the slots 15, I provide an ofiset 22 on each blade, the face of which is continuous with the concave face of the blade and which may be milled in the same operation with the milling of the face of the blade. The channels 21 are U shaped and are formed'by guide or channel block 23 and guide block partition pieces 24. The channel block 23 is provided with a'plnrality of substantially crescent shaped depressions,

deeper at their inner ends and arranged in stepped relations. The crescent shaped face 25 of eachfdepression is inclined to the lateral face of the wheel 8 and the dividing faces 26 between adjacent depressions are normal to the planes of the faces 25.

The partition pieces 24 coiiperate with the normal faces 26 to form the U shaped delivery channel which reverses steam and redelivers it tothe blade 9. These pieces 24 consist of a fiat crescent shaped portion 27 which conforms inshape to the faces 25 of the channel block 23, and a U shaped extension or partition 28 which is beveled oil at 29. The crescent shaped 'portion 27 of each pieceis adapted to be secured. to one a llatbcad countersunk screw :26.

tlhons :28 coi pcrate with the faces 26 ot' the of the faces .33 of the block 21. by means of The parchannel block 2.? to form the lluid reversing passages, whi h receiye the laid delivered from the passages formed by the slots ll: of the blades and deliver it to the passages formed by the slots 15 of the blades. These (Lil channels extend substantially radially of the turbine and one or more may be provided for each delivery nozzle 11.

In order that the turbine may operate elli ciently and that the channel 21 may cli-- cicutly rece ve and dclivermotivc fluid, it

is es ential that the walls of these channels extend into close proximity with the passages formed by the slots 14 and 15 of the blades. Inasmuch as each of the blades 9 is provided with an ofi'set 22, I tind it advisable to provide an oilset 31 on the channel block 2 so that the upper end of the channels 21 will project into close proximity with the passages formed by the slots 15. The upper arm of the U shaped partition 28 of each piece 24 is longer than the. lower aim and consequently the beveled edges 29 of the partitions project out farther at the outer side of the channel than at the inner. With this arrangement steam issues from the passages formed by the slots 1.4 at the proper angle and is delivered at the proper angle to the passages formed by the slots 15.-

lVhat I claim is:

1. A turbine blade adapted to receive motive fluid at two points and an offset on said blade for increasing the delivery angle at one pointpf the blade.

v 2. A turbine blade provided with an oil'- set for increasing the angle of delivery of the blade at one point.

3.11 turbine blade provided with fluid delivery passages in its convex face, and an oiiset at one point to increase the delivery angle of the blade at that. point. 4. A turbine blade provided with an oil'- set at one point, and means for rendering the blade effective as a working agent at two points along its length. In testimony whereof, I subscribed myname this 22nd day of 1909.

have hereunto July,

HENRY SCHMIDT.

ill)

Hit) 

